I have to admit I was not connecting those dots . I've been using that same board name for so long it's become ingrained and I don't even think about it. It started out originally as R1 on the very first board I registered for 12-13 years ago, and the second 1 was added not long after when I found R1 was already taken on a another board I was signing up for. I didn't occur to me until later though that it's basically the designation for a class of wall insulation